在测试前端时重置单独的后端服务

I have an API project running at localhost:8000 connected to a test database, and I have a front-end angular app running at localhost:9000. How do I reset the database after each front-end test case run? I'm using Protractor for my front-end E2E testing. I do not want to mock or stub the whole backend. Although that will make my test run faster, however, every user interaction will result changes to the server states and followed by several more requests to the same server endpoints, stubbing these endpoints with different returns at different points might be too much code than just talking to a real server. I'd rather reset the database to an initial state or flush all the tables. I have an API project running at localhost:8000